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google xbins.exe and you'll be able to get the tutorials and software needed.
personally i've had best results with via chipsets, i've never used IDE to do it but have heard bad reports, you can buy a pci card to give you the via chipset preferred for about £5 - £10. then its simply a matter of running the iprep and pointing it to the new firmware then booting the PC off the floppy/usb that iprep makes and following the tutorials